What was found
PDIS AT FL210 AND CLIMBING HEARD LOUD BANG FOLLOWED BY SOUND OF RUSHING AIR. CABIN ALTITUDE BEGAN CLIMB. STOPPED CLIMB AT 230 AND CABIN CONTINUED TO CLIMB. SUSPECT LOSS OF AVIONICS DOOR SEAL AND RTB. FOUND E/E DOOR SEAL TORN, MPN ABA7800-1. REMOVED AND REPLACED AVIONICS DOOR SEAL ASSY AS PER SMP. PERFORMED ADJ/TEST OF AVIONICS DOOR ASSY AS PER MD-11 AMM 52-41-01-5. OPS TEST FOUND OKAY, ALSO PERFORMED FUSELAGE PRESSURE DECAY ADJ/TEST AS PER MD 11 AMM 21-00-00-5, OPS TEST FOUND "SATIS ".